How to Repair Rust Under the Car Door?
2 Answers
Grind off all the rusted areas completely, apply a layer of anti-rust paint first, and after the anti-rust paint dries, apply a layer of color paint that matches the original car color on the surface. Here are some tips to prevent car doors from rusting: 1. Be wary of minor scratches: Rust often appears on the car paint surface. In addition to common collisions and scratches, small stones kicked up by tires while driving can hit the paint surface, causing small flaking spots that can develop into small rust spots over time. These minor damages are often overlooked because they are mostly in inconspicuous places. Therefore, regularly inspect the car body, engine hood, and around the vehicle, and address any issues promptly once discovered. 2. Frequently check the humidity in areas prone to water accumulation: It is inevitable to encounter rainy or snowy weather or drive through muddy and waterlogged roads. Mud and sludge can easily accumulate in gaps such as the bottom of the vehicle and the interior floor. If not cleaned in time, this can trap moisture. Therefore, regularly inspect areas like the inner and outer edges of the wheel hubs, doors, bottom corners of the trunk, keyholes, and moving parts of the wiper arms. Also, ensure that the drainage holes in the doors and various parts of the body are clear, and check the humidity of interior coverings, such as carpets, to prevent rusting of floor components.
I just dealt with door rust issues last month, and as a DIY enthusiast, I found the repair quite feasible. The process was: first, use coarse sandpaper to thoroughly remove all rust from the affected area, ensuring the metal surface is smooth; after cleaning, apply an anti-rust primer to prevent corrosion recurrence; for any small holes, use automotive filler paste to level and sand smooth; once dry, spray paint matching the original color to protect the new surface. Always wear gloves and work in a well-ventilated area to avoid inhaling chemicals. I also checked the door drainage holes post-repair, clearing any debris to prevent water accumulation and future rust. The entire process took an afternoon in my home garage, costing less than 50 yuan in materials. I recommend choosing a dry day for the job as the paint dries more easily. DIY not only saves money but also teaches you a lot.
